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using System.Threading.Tasks;
using ElmSharp;
using EImage = ElmSharp.Image;
using ESize = ElmSharp.Size;
namespace Xamarin.Forms.Platform.Tizen.Native
{
/// <summary>
/// Extends the ElmSharp.Image class with functionality useful to renderer.
/// </summary>
public class Image : EImage, IMeasurable
{
Aspect _aspect;
/// <summary>
/// Initializes a new instance of the <see cref="Xamarin.Forms.Platform.Tizen.Native.Image"/> class.
/// </summary>
/// <param name="parent">The parent EvasObject.</param>
public Image(EvasObject parent) : base(parent)
{
IsScaling = true;
CanScaleUp = true;
CanScaleDown = true;
ApplyAspect(Aspect.AspectFit);
}
/// <summary>
/// Gets or sets the image aspect ratio preserving option.
/// </summary>
/// <value>The aspect option.</value>
public Aspect Aspect
{
get
{
return _aspect;
}
set
{
if (_aspect != value)
{
ApplyAspect(value);
}
}
}
/// <summary>
/// Loads image data from the given <see cref="Xamarin.Forms.ImageSource"/> asynchronously.
/// </summary>
/// <returns>A task which will be completed when image data is loaded.</returns>
/// <param name="source">Image source specifying from where the image data has to be loaded.</param>
public Task<bool> LoadFromImageSourceAsync(ImageSource source)
{
IImageSourceHandler handler;
if (source != null && (handler = Registrar.Registered.GetHandler<IImageSourceHandler>(source.GetType())) != null)
{
return handler.LoadImageAsync(this, source);
}
return Task.FromResult<bool>(false);
}
/// <summary>
/// Implements the <see cref="Xamarin.Forms.Platform.Tizen.Native.IMeasurable"/> interface.
/// </summary>
/// <param name="availableWidth">Available width.</param>
/// <param name="availableHeight">Available height.</param>
public ESize Measure(int availableWidth, int availableHeight)
{
var imageSize = ObjectSize;
var size = new ESize()
{
Width = imageSize.Width,
Height = imageSize.Height,
};
if (0 != availableWidth && 0 != availableHeight
&& (imageSize.Width > availableWidth || imageSize.Height > availableHeight))
{
// when available size is limited and insufficient for the image ...
double imageRatio = (double)imageSize.Width / (double)imageSize.Height;
double availableRatio = (double)availableWidth / (double)availableHeight;
// depending on the relation between availableRatio and imageRatio, copy the availableWidth or availableHeight
// and calculate the size which preserves the image ratio, but does not exceed the available size
size.Width = availableRatio > imageRatio ? imageSize.Width * availableHeight / imageSize.Height : availableWidth;
size.Height = availableRatio > imageRatio ? availableHeight : imageSize.Height * availableWidth / imageSize.Width;
}
return size;
}
/// <summary>
/// Sets the <c>IsFixedAspect</c> and <c>CanFillOutside</c> properties according to the given <paramref name="aspect"/>.
/// </summary>
/// <param name="aspect">The aspect setting to be applied to the image.</param>
void ApplyAspect(Aspect aspect)
{
_aspect = aspect;
switch (_aspect)
{
case Aspect.AspectFit:
IsFixedAspect = true;
CanFillOutside = false;
break;
case Aspect.AspectFill:
IsFixedAspect = true;
CanFillOutside = true;
break;
case Aspect.Fill:
IsFixedAspect = false;
CanFillOutside = false;
break;
default:
Log.Warn("Invalid Aspect value: {0}", _aspect);
break;
}
}
}
}
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